bpo-30125: disable faulthandler in ctypes test_SEH (#1237)

Disable faulthandler to run test_SEH() of test_ctypes to prevent the
following log with a traceback:

    Windows fatal exception: access violation

Add support.disable_faulthandler() context manager.

1 files changed, 16 insertions, 0 deletions

diff --git a/Lib/test/support/__init__.py b/Lib/test/support/__init__.py
index d3beef2..56b6b07 100644
--- a/Lib/test/support/__init__.py
+++ b/Lib/test/support/__init__.py
@@ -2595,3 +2595,19 @@ def setswitchinterval(interval):
         if _is_android_emulator:
             interval = minimum_interval
     return sys.setswitchinterval(interval)
+
+
+@contextlib.contextmanager
+def disable_faulthandler():
+    # use sys.__stderr__ instead of sys.stderr, since regrtest replaces
+    # sys.stderr with a StringIO which has no file descriptor when a test
+    # is run with -W/--verbose3.
+    fd = sys.__stderr__.fileno()
+
+    is_enabled = faulthandler.is_enabled()
+    try:
+        faulthandler.disable()
+        yield
+    finally:
+        if is_enabled:
+            faulthandler.enable(file=fd, all_threads=True)